PatchTheCVECVE-2025-67221: The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.
CVE-2025-67221 is a high-severity flaw (CVSS 7.5) affecting orjson. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-770 |
| Published | 2026-01-22 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-67221?
orjson: upgrade to newer than 3.11.4. Exact commands for each OS are on this page.
Is CVE-2025-67221 being exploited?
CVE-2025-67221 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-67221 affect?
CVE-2025-67221 affects orjson. Severity is high (CVSS 7.5). The orjson.dumps function in orjson thru 3.11.4 does not limit recursion for deeply nested JSON documents.
How urgent is CVE-2025-67221?
Priority 49/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action